In celebration of the baseball movie’s 25th anniversary, Costner arrived at the field near Dyersville in Iowa with his young kids Cayden, seven, and Hayes, five, and tossed a ball around with the boys.
Hundreds of fans gathered to watch the spectacle.
Costner told local newspaper the Waterloo-Cedar Falls Courier, "We don’t usually have this many people around when we do this."
The movie star played a farmer who builds a baseball field on his land in the 1989 film.
He was joined by some of his co-stars, including Timothy Busfield, for the anniversary celebration.